Question: A mixture of A (more volatile) and B is being separated in a plate distillation column. In two separate tests run with a saturate- liquid

A mixture of A (more volatile) and B is being separated in a plate distillation column. In two separate tests run with a saturate- liquid feed of 40 mol% A, the following compositions, in mol% A were obtained for samples of liquid and vapor streams from three consecutive stages between the feed and total condenser at thetop:

Mol% A Test 2 Test 1 Vapor Liquid Vapor Liquid Stage 68.0 75.0 68.0 M+2 79.5 60.0 68.0 60.5 M+1 74.0 67.9 51.0 60.5 53.0

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